netdev - Re: [PATCH RFC 3/3] net_sched: Add size table for qdiscs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 21 Jul 2008 15:00:33 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH RFC 3/3] net_sched: Add size table for qdiscs

Jussi Kivilinna wrote:
> Quoting "Patrick McHardy" <kaber@...sh.net>:
> 
>>> @@ -123,9 +123,9 @@ static int tbf_enqueue(struct sk_buff *skb,  
>>> struct Qdisc* sch)
>>>     struct tbf_sched_data *q = qdisc_priv(sch);
>>>     int ret;
>>> -    /* qdisc_tx_len() before qdisc_enqueue() wrapper, might return 
>>> different
>>> -     * length than after wrapper. Should recalculate tx_len here if 
>>> q->qdisc
>>> -     * has size table? */
>>> +    if (q->qdisc->stab)
>>> +        qdisc_calculate_tx_len(skb, q->qdisc->stab);
>>> +
>>
>> I don't think this will help, the inner qdisc might again have
>> an inner qdisc that increases the size. So this probably needs
>> to be handled during dequeue.
>>
> 
> I don't quite follow you here, what needs to be handled during dequeue? 
> tbf's q->max_size check?


Yes. You check on ->enqueue by using the inner qdiscs size table,
but that qdisc might again have an inner qdisc which increases
the size, which you can't check during ->enqueue.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html